Pneumatic tire and clamping means.



H. M. HARTMAN.

PNEUMATIO TIRE AND GLAMPING MEANS.

APPLIGATION FILED PBB.28,1908.

Patented Julj-13, 1909.

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HARVEY M. HARTMAN, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR OF ONE-HALF TO OSCAR P. HANSON, Ol" MINNEAPOLIS, MINNESOTA.'

PNEUMATIC TIRE AND CLAMPING MEANS.

To ali 'whom 'it may concern:

Be it known that I, HARVEY M. HARTMAN,

a citizen of the United States, residing at lt'inneapolia in the county of Hennepin and State ofhlinnesota, have invented certain new and useful Improvements in Pneumatic Tires and Clamping Means; and l do hereby declare the following to be a full, clear, and exact descri r)tion of the invention, le such as will enable others skilled in the art to which it appertains to make and use the My invention has for its object to provide an improved pneumatic tire, and to the above ends the .invention consists of the novel devices and combinations of devices hereinafter described and delined in the claim.

In the accompanying drawings which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings, Figurel is a View in side elevation, with some parts broken away and some. parts sectioned, showing a wheel, such as an auton'iobile wheel or abicyele wheel, and illustrating my invention applied thereto; and Fig. 2 is an enlarged section, taken on the line .r2 of Fig. 1.

Oi the parts ole the wheel, the numeral l indicates the hub, the immoral 2 the spokes and the numeral 3 the wheel rim proper, the latter being, ol course, secured to the outer ends ol the spokes in the usual or any suitable way. ln accordance with my invention this rim 3, at one side, is provided with an outwardly curved (lange or Haring portion Sn; and, at its other edge, it is provided with spiral threads 3' that engage with the correspondingly formed threads ol' a detachable clamping ring 4. The l'ace of this clamping ring 4 is ol such curved contour in cross scctionthat it cooperates with the Haring portion wheel rim to l'orm a transversely eoncaved channel, adapted to receive and :fit the inner portion ol' the tire 5 and to hold the latter against lateral' dis]' lacement when said tire is inflated.

',lhe tire 5 is a split tire or tube having, at its edges, inwardly extended edge l'olds formed with abutting approximatelystraight surfaces t3, The tire 6 is constructed 3a and the body 3 of the` Specification of Letters Patent.

Application led February 28, 1908.

Patented-July '13, 190e.

Serial. NO. 418,358.

.nally covered with rubber. The opter ru'bber covering at thelower portions of the straight surfaces 6a are thickened up 'to form approximately triangular joint strips' 5 which, of course, are endless and extend eircumferentially of the tire. The canvas portions of the edge folds have the greatest cross section at their extreme inner. edges; and, in fact, diminish in cross section approximately to the points where they bear against the wheel rim. Immediately below their thickened inner edges they, are undercut or slightly grooved to form annular seats 6b that are adapted to receive, in whole or in part, metal clamping hoops or rings 7.

Also as preferably constructed, one ot' the edge folds has a small .rubber or pliable sealing flap 6C that is arranged to be seated against the other edge l'old 6 by air pressure from within the tire.

When the tire is deilated and the clamping .ring 4- is removed from the rim 3, the tire may be very easily placed in working position on said rim or removed therefrom, together with the hoops 7, which latter may all the time remain seated within the tire. then the tire is placed in working position, as shown in .F ig. 2, and the clamping ring 4 is screwed onto the rim 3 and the tire is then inflated, the edge folds 6 will be tightly pressed together and will be forced. against the rim w1th a clamping or wedge action, which insures an air-t1ght joint between the said parts, and, hence, cause the air pressure from within thev tire to react agamst theI same and force the folds 6 together and against the ltire. It is, of course, evident that the inner portion of thel tire being thus held against expansion b the hoops cannot move laterally ofi from tlie expanded or en; larged edge portions of the wheel rim.

The expanding stress on the tire, due to the compressed air contained therein, of course tends to pull the edgefolds of the tire outward from under the retaining hoops 7, but as the said hoops cannot separate, to any perceptible extent, and as the canvas portions ol the tire have inwardly increasing cross sect ion, such expanding strain simply caused to wedge the edge folds of the tire more tightly together and against the wheel rim. Furthermore, the rubber' joint strips 5 very greatly assist in forming a tight joint chiefly et' canvas but is internally and exterbetween the tire and the wheel rim 3. The

sealing flap 6C assists in closing the joint bel position on the rim 3 and, hence, against A8, one end of Which is secured to the rim 3.

tween the edgefolds of the tire, especially when the tire is receiving its initial charge. vTo lock the clamping ring 4 in working accidental displacement7V I preferably provide a latch device in the form of a leaf spring At its free end, this spring latch 8 is provided .with a pin or lug 9 that Works through a peri foration in said rimvand is adapted to engage with a perforation in said clamping ring 4., The improved tire above described is capable'of application to almost any kind of a channel-shaped rim7 but is especially adapted for application to a detachable rim, that is, to a rim having one or more detachable side flanges.

What I claim is:l

The combination ivith a concave Wheel provlded with a detachable flange of a spht pneumatic tire formed with edge folds 6 adapted to be brought together adjacent to said rim and having approximately flat surfaces 6L and pliable joint strips 5a formed as a part of the tire, the said flanges 6 being formed withv under-cut annular seats 6b, and hoops 7 in said tire engaging said seats 6P vand serving to hold the inner edge folds of said tire in contact with each-other and with the wheel rim, substantially as described.

In testimony whereof I aiiix my signature in presence of two Witnesses. i

HARVEY M. HARTMAN.

l/Vitnesses Y II. I). KILGORE, I?. I). MERCHANT. 

